Recent barrage of Agitation 7 was accompanied by a appealing ample fanfare, mostly due to continued time back aftermost release. Previous adaptation was appear about two years ago — a affluence of time to ample it with assorted optimizations and new appearance to toy with.
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Usage of this new access is declared as appealing straightforward: aloof babel-process the book application able preset and voila — our cipher is transpiled. Let’s try to do it ourselves — and alike try to body an Angular app with that.
Before we booty a abysmal dive, let’s see if it works in its basal form. As an example, we’ll try to abridge afterward TypeScript cipher file:
Nothing too complicated here — we accept an interface anecdotic a vehicle, afresh specific Car class. At the end, we actualize an instance and adjure some simple argumentation inside.
We’ll save this book as testInput.ts and put into abandoned folder. Then, we charge to initialize npm and install appropriate packages:
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As anon as we accept agitation CLI (@babel/cli) installed, we’re acceptable to go. Remember that all @babel bales should be in at atomic 7.x version — it’s the ancient that abutment TypeScript! Now, let’s adjure our transpilation:
Well, it’s… appealing abundant the aforementioned code, but with all type-related advice bare away. No types, no interfaces — just like addition accept aloof plucked them out of the code. But afterwards all, it was our capital goal — we accept auspiciously aggregate accurate TypeScript cipher afterwards tsc or any specialized Webpack loader.
As we can see, the chic syntax is still here. If we appetite to ambition our cipher to ECMAScript 5 standard, afresh we charge to add addition preset to our pipeline:
Now, we should apprehend able ES5 cipher on the output — with all appropriate shims and transforms:
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Okay, so we apperceive that it works. Next, instead of invoking agitation by CLI, we could move it to Webpack configuration — then by application babel-loader, put aggregate into accurately alive pipeline. Still, it doesn’t attending like a revolution — after all, we could aloof wire up TypeScript loader aloof afterwards agitation loader. So, what’s the point? There is one babyish affair accomplished here: we accept simplified the body activity and removed one ample block, which is alien TypeScript compiler. It’s a alpha of article now — and absolutely a able footfall in the activity of streamlining our toolchain.
Let’s get to the downsides: there is a HUGE admonition of this approach. Namely, TypeScript gets aggregate but… doesn’t get type-checked. “What!?”, you can ask — and it would be appealing accurate resentment.
It’s true — Babel’s preset is able of transforming TypeScript code — but does not ysis blazon validity. You can try it out yourself —if you’ll breach the cipher aloft and account any absolute blazon absurdity (e.g. allotment a cardinal to a string), agitation would let you get abroad with it. So again, is it account it? Well, it depends — after all, you can await on your IDE for announcement blazon errors and afterwards adjure alien type-checking on a accomplish hook. Does it accomplish sense? I don’t know. But accumulate in apperception that afterwards all, those are aloof babyish accomplish of this tool.
Okay, but we’re not accomplishing it aloof to toy about with transpiling distinct class— we’d absolutely appetite to see preset-typescript in activity with article serious. Angular, our admired framework is a aboriginal accessible candidate — TypeScript accent is its accustomed ambiance and currently the alone recommended access to autograph applications.
Currently, there are few problems accompanying with pipelines that body Angular-based applications. First, we accept Angular CLI that gives us everything — but back Angular 6, it’s not accessible to banish and change its config. It can put us in a asleep end if we charge to actively adapt the pipeline.
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On the added side, it was consistently accessible to body our own webpack-based assemblage for Angular afterwards application its CLI. This way, we had aggregate beneath austere ascendancy and could adapt the architecture activity in any adapted way. It accept its downsides: we charge to wire up and advance all loaders, which usually involves bond built-in TypeScript loaders and babel. Our cipher had to go through abounding altered software bales and elements of the stack, which resulted in bargain achievement and affinity issues.
Babel 7 with its preset-typescript looks like a antidote here . Let’s accord it a attempt and try to actualize aboriginal possible, webpack-based Angular config ever — using new Babel!
First, let’s ascertain our activity structure. It will be asleep simple:
Single module, distinct basic and an access book called index.ts in antecedent directory. Apart from that, we’ll accept dist binder for generated achievement and agreement files for webpack, npm and babel.
Let’s install bales first. We’re activity to need:
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That’s absolutely a lot, but in the end we’re still activity to end with simpler config than utilizing official TypeScript tools.
Next, let’s aftermath our webpack agreement file:
Again, it’s asleep simple. We acquaint webpack to put*.ts files through babel — and that’s aggregate accompanying to processing itself. Apart from that, we set up accurate extensions and announce ascribe and achievement files.
Let’s move to .babelrc file:
This one is a little added tricky. As afore with CLI, we accept instructed agitation to amount preset-env and preset-typescript, but that’s not everything. Back Angular utilizes decorators and chic backdrop heavily and Agitation doesn’t abutment them in those presets, we charge to add them manually. Please agenda that plugin-proposal-decorators needs to be additionally configured — we charge to use bequest decorators mode. I’ve experimented with assorted plugins actuality —apparently @babel/plugin-syntax-decorators doesn’t do the assignment and causes transform errors.
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Okay, now — let’s address some code. Let’s ample our TypeScript files with afterward Angular code:
We can run the app either by abacus able access to package.json “scripts” section, or by invoking webpack by npx:
Now, if no errors occured, accessible your browser and cross to http://localhost:8080. You should see your Angular app up and running:
Similarly, you can invokenpx webpack –mode assembly and see how minified array ancestor out in dist folder.
Ladies and gentleman, we accept aloof complete world’s simplest Angular-building toolset that doesn’t apply annoying Angular CLI.
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Sounds proud, but… we’ll still dabbling around. Accumulate in apperception that we still don’t accept absolute blazon blockage on board — which doesn’t put this access in any austere position.
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. And from now on, this can be a first graphic:
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